Transfer-roller for lithographic presses.



G. WAGNER & A. HORMEL. TRANSFER ROLLER FOR LITHOGRAPHIG PRESSES.

APPLICATION FILED MAY 9 1914.

Patented Feb. 23, 1915.

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TRANSFER-ROLLER 1510B, IQITHGGWHJEC PRESSES.

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specification of Letters Patent.

Patented Feb. 23, 1915.

original appltcabtonntea January 15, 191 1, Serial No. 812,172. Divided and this application filed May 9,

- ram. serial No. 837,375.

To all whom it may concern:

'Be it known that we, CHARLES WAGNER, a citizen of the United States, residing at Grantwood, county of Bergen, and State of New Jersey, and Aoens'r' HORMEL, a citizen of the United States, residing at New York city, county and State of New York, have invented certain new and useful Improvements in Transfer-Rollers for Lithographic Presses, of which the following is a specification.

This invention relates to a novel transfer roller for lithographic presses and more particularly to novel means for securing the transfer blanket under the proper tension to the supporting drum.

This application is a division of .an application for lithographic press filed by us January 15, 1914 under Serial Number 812,172.

In the accompanying drawing: Figure 1 is a sectional side view of a transfer roller embodying our invention; Fig. 2 a cross section on line 22, Fig. 1, and Fig. 3 a plan of .the blanket;

Our improved transfer roller comprises essentially a cylindrical body or drum and a transfer blanket 11 laid around said body. For properly tensioning the blanket to the drum, the latter is provided with a longitudinally extending slightly tapering surface groove 12 adapted to receive a correspondingly tapering key 13, the height of said key being considerably less than "the depth of groove 12. Key 13 is secured in position by means of a number of screws till 14 assing loosel through corresponding per orations of t e key and tapped into threaded bores 15 of drum 10. These screws extend through eyelets 16 secured to blanket 11 along the overlapping edges 11 thereof, as clearly illustrated in Figs. 1 and 2. Screws 1% alternate with dowel pins 17 projecting inwardly from key 13 and likewise engaging eyelets 16 of blanket 11. Pins 17 are adapted to be freely received within corresponding sockets 18 of'drum 10.

WVhen applying. a blanket 11 to drum 10,

the dowel pins 17 are pamedthrough alined eyelets 16 whereupon the key 13 is inserted into groove 12, the p1ns 17 engag ng the corresponding sockets 18 of drum 10 thereby properly centering the key. Screws 14 are finally tapped into bores 15 and are tightened up to such an extent as "to properly tensionblanket 11 around drum 10.

lt Wlll be seen that by our invention,

novel and efiective means are provided for commodated Within the drum-groove, the

thickness of said key being considerably less than the depth of the groove, dowel pins projecting inwardly from the key and passing through alinedperforations of the overlapping blanket-ends, and means for forcing the key into the groove to an extent sufficient for causing a tensioning of the blanket.

2. A transfer roller. for lithographic presses, comprising a drum provided with a longitudinally extending surface groove, a blanket encircling said drum and having overlapping perforated ends that are received within said groove, a perforated key also accommodated within the drum-groove, the thickness of said key being considerably less than the depth of the groove, dowel pins projecting inwardly from the key and passing through alined perforations of the overlapping blanket-ends, and screws passing through the key-perforations for drawing the key into the groove to an extent suflicient for causing a tensioning of the blanket.

3. A transfer roller for lithographic presses, comprising a drum provided with a longitudinally extending surface groove, alternating sockets and threaded bores provided in the drum at the bottom of said groove, a blanket encircling said drum and having overlapping perforated ends that are received within said groove, a key ac commodated within the drum. groove and having alternating dowel pins and perforations, said dowel pins passing through the blanket-perforations and being received within the drum-sockets. and screws passing through the key-perforations and blankart-perforations and tapped into the drumconsiderably less than the depth of the groove, dowel pins projecting. inwardly from said key and passing through alined perforations of the overlapping blanketends, and means for forcing the key into the groove to an extent sufficient for causing a tensioning of the blanket. 7

CHARLES WAGNER. AUGUST HORMEL. Witnesses:

ARTHUR E. ZUMPE, Mahatma HmscH. 

